I did this once in a FoxPro app (a very long time ago), multi day events were displayed as a solid bar about 3/4 of the way to the bottom of the day square in the month view. a 3 day event would display a continuous bar spanning 3 days. Click the bar, it shows the details of the event. If there is more than 1 MDE, the bars run together, and you can't tell where 1 event ends and another begins. I suppose you could display a number in the bar in each day if there are more than 1 for that day. Then you can tell where events begin and end because the numbers increment or decrement. When you click on the bar you get a list of MDEs that include the day in which you clicked the bar.
Of course, the best way to show MDEs is the good old gantt chart, but that's another thread.
- Paul